Device for dressing or cutting millstones



2 Sheets-Sheet 1.

(No Model.)

J. A. BEAMISDERFER. DEVICE FOR DRESSING 0R CUTTING MILLSTONES.

Patented July 22, 1890.

witnesses v v 2 Shets-Sheet 2.

J. A. BEAMISDERFER. DEVICE FOR DRESSING 0R CUTTING MILLSTONES.

No. 432,592. Patented July 22, 1890.

(No Model.)

@JZM. 14mm UNITED "STATES P TENT OFFICE.

JOSEPH A. BEAMISDERFER, OF BELLE GROVE, PENNSYLVANIA DEVICE FOR DRESSING OR CUTTING MILLSTONES.

SPECIFICATION forming part of Letters Patent No. 432,592, dated July 22, 1890.

Application filed November 15, 1889. Serial No. 330,386. (No model.)

To all whom it may concern:

Be it known that I, JOSEPH A. BEAMIS- DERFER, a citizen of the United States, residing at Belle Grove, in the county of Lebanon and State of Pennsylvania, have invented certain new and useful Improvements in Machines for Dressing Millstones; and I do declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, and to the figures of reference marked thereon, which form a part of this specification.

My invention relates to improvements in machines for dressing millstones or for forming the furrows in the grinding-surfaces thereof.

The object of my invention is to provide a portable machine for dressing millst-ones which shall be simple and economical in construction, durable in use, not liable to get out of order, and which will effectually and expeditiously perform or accomplish the pur-' poses for which it is designed.

My invention consists, essentially, of a bed mounted upon legs which are designed to rest upon the millstone to be 'dressed,with a rackbar connected therewith, and with which hand-gears mounted in a reciprocating frame mesh. This reciprocating frame carries a vertical bar or rod, carrying at its lower end a pick or chisel, which cuts the furrows in the stone. This rod is reciprocated byacam on a rotating shaft, and at its upper end is provided with a coiled spring, which serves to give force to the blow.

The invention also consists in certain details of construction and combinations of parts, which will be hereinafter fully described, and then pointed out in the claim.

The invention thus briefly outlined in the above description will now be more particularly described with reference to the accompan ying drawings, in which- Figure 1 is a central longitudinal section of a millstone dressing-machine constructed according to my invention; Fig. 2, an end view of the same. Fig. 3 is a detail view of one of the picks or. cutters, and Fig. 4 a detail view of the spring-arms used for securing the reciprocating frame to the bed.

In the said drawings, the reference-numeral 1 designates the bed of the machine, being rectangular in form and composed of, two side rails 2 and two end rails 3, suitably connected together. This bed is mounted upon legs 4, so as to be elevated a short distance above the millstone, upon whichthe said legs are designed to rest. Secured to the outer sides of the rails 2 are rack-bars 4, for the purpose hereinafter explained. These rackbars are located near the middle of said rails, as indicated by the dotted lines in Fig. 1.

The reciprocating frame, carryin g the pick or cutter bar, consists of two longitudinal bars 5 5, resting upon the side rails 2, and two vertical standards 6 6, connected by the upper and lower cross-bars 7 and These uprights are firmly secured to the bars 5.

9 designates the cutter or pick bar, which passes through central apertures in crossbars 7 and S, which form hearings or guides for it. At its lower end this bar is formed with a central slot and is surrounded by a metallic thimble 10, having a perforation therein to receive a set-screw 11,whieh passes through a similar perforation in the bar, whereby a pick or cutter inserted in the slot is retained in place.

Journaled in brackets 12, secured to the uprights or standards (3, is a shaft 13, which carries a cam-wheel 14, provided with a series of cam faces or projections 14, and by which the cutter-bar is raised or elevated. Mounted in the same brackets 12, but below shaft 13, is another shaft 15, provided atone end with a balance-wheel 16. At its other end it carries a gear-wheel 17, meshing with a larger gear-wheel18 on shaft 13, this latter shaft also being provided with a crank 19.

The numeral 20 designates an adjustable collar having a pin 21, by which it may be held on the bar 9. Thiscollar is provided with a flange 22, against which the canr'faces 14: of the wheel 14: strike. The upper end of the bar 9 is encircled or embraced by a thimble having at its lower end a head 24. This thimble also passes through the aperture in. the cross-piece 7. Intermediate of the thimble 28 and collar 20, and confined therebetween, is a coiled spring 25. The thimble 23 is immovably held in place by means of the set-screw 26 during the operation of the machine, but is capable of adjustment upon said rod 9 by loosening screw 26, said screw passing through the bracket 27, secured to the cross-piece 7, passing through a hole in the latter and bearing against the thimble. From this description it will be seen that the spring is compressed between collar 20 and thimble 23 as the bar is elevated by the cam-wheel, and to regulate its tension the thimble 23 is adjusted up or down upon the bar and held in its adjusted position by the set-screw 26/ In the lower inner ends of the standards 6 are secured spring-arms 28, which extend down to the under side of the side rails 2, Where their ends are bent outwardly, forming short flanges, which bear against the under sides of rails 2 and prevent this end of the frame from jumping upwardly. At the ends of the bars 5 are secured, by means of thumbscrews 29, the clamps, which consist of the vertical bars 30, having the end flanges 31, said flanges engaging over and under the bars 5 and rails 2, respectively, and thus holding the bars in place. Mounted in the bars 5 is a transverse shaft 32, having at each end a gear-wheel 33, which meshes with the rackbars 4, and at one end provided with a handwheel 34, by which said gear-wheels are rofated and a reciprocating motion imparted to the frame carrying the cutter-bar. 35 desig nates a curved brace secured'to each standard 6 and to the bars 5, for rigidly bracing said parts. They are also secured intermediate of their ends to the cross-bar 8.

In Fig. 3 is represented one of the cutters or picks which form the furrows. As seen, this cutter consists of a rectangular cutterhead 36, having the face 37 formed thereon in an inclined plane; but other forms of cutters or picks may be used, if desired, as I have found that much better results can be secured than by making them in a straight plane. The head is also provided with a shank 38, to fit within the socket in the lower end of the cutter-bar. The side rails 2 are shown as being recessed or cutaway at 39, for the purpose of allowing the clamps 30, together with the cutter-bar-carrying frame, to be lifted from the bed, it only being necessary to loosen the lower screws, which secure the springarms 28 to the standards 6, and pushing their flanged ends from beneath the side rails 2.

The operation is as follows: The machine is placed upon the stone to be dressed, the operator sitting upon one of the end rails 3. With one hand he seizes the crank 19 and rotates shaft 13, which by means of wheels 17 and 18 rotates shaft 15 and balance or fly wheel 16, the object of which will be obvious. Shaft 13 rotates cam-wheel 14, and the cam faces or projections 14, striking underneath of flange 22 of collar 20, firmly secured to bar 9, will raise the latter and elevate the cutter or pick in the lower end thereof. At the same time spring 25 is compressed between collar 20 and thimble 23, As the cam-wheel continues to revolve, the cam-faces pass out of contact with flange 22, which releases the spring, the resiliency of which forces the cutter-bar and cutter downward, giving a quick sudden blow which is very effective in cutting the furrows. This operation is repeated as long as shaft 13 is rotated, the series of cam-faces causing the blows to be delivered in quick succession. At the same time that the above operation is being effected the frame is reciprocated or moved back and forth upon the bed by means of the hand-wheel 34, rotating shaft 32, the pinions or gear-wheels 33 of which mesh with the racks 4, secured to the rails 2.

The advantages of my machine will be obvious to those skilled in the art to which the invention pertains, though it may be well to state that the quick sudden blows given to the pick or cutter in rapid succession soon causes the furrow to be out, and as such furrows are taperingthat is to say, deeper atone end than the other-this is readily effected by the beveled cutter-face, upon which the cutting-teeth are formed and the reciproeating or back-and-forlh movement of the cutter in the furrow.

The machine is Very simple in construction, none of its parts being of a complicated nature. It is inexpensive to manufacture, and not liable to get out of order by constant use. It is portable, and can be readily transferred from place to place, and can be applied to a millstone with ease and celerity and renioved therefrom with facility. It entirely does away with the labor and consequent loss of time incident to hand labor, and millstones dressed thereby are much superior and operate with greater effectiveness than when dressed by hand.

Having thus described my invention, what I. claim is In a device for cutting or dressing millstones, the combination, with a stationary frame, a reciprocatingframe mounted thereon, and a vertical pick-carrying frame mounted on the reciprocating frame, of spring-arms secured to the upright and reciprocating frames, the lower bent portions of said arms engaging the under side of the stationary frame and serving as guides for the reciprocating IIO fra1ne,in connection with the herei n-described 

